Sky background accounting in spectral infrared observations of extended objects at the Caucasus Mountain Observatory of the SAI MSU
Fuente:
arXiv
Salvato in:
| Autori principali: | , , , |
|---|---|
| Natura: | Preprint |
| Pubblicazione: |
2026
|
| Soggetti: | |
| Accesso online: | |
| Tags: |
Aggiungi Tag
Nessun Tag, puoi essere il primo ad aggiungerne!!
|
| _version_ | 1866918450594578432 |
|---|---|
| author | Gusev, A. S. Tatarnikov, A. M. Zheltoukhov, S. G. Kirsanova, M. S. |
| author_facet | Gusev, A. S. Tatarnikov, A. M. Zheltoukhov, S. G. Kirsanova, M. S. |
| contents | The Caucasus Mountain Observatory of the Sternberg Astronomical Institute of Moscow State University is the only one in Russia and one of the few in the world where is possible to obtain spectral data in the near-infrared (IR) range at $λ$=1-2.5 $μ$m. However, there is a problem of processing the spectra of extended objects, the angular dimensions of which exceed the length of the slit (4.5 arcmin). Obtaining additional spectra of the sky in the immediate vicinity of such objects does not solve the problem, since bright atmospheric hydroxyl lines at $λ$~2 $μ$m change their intensity significantly over a time shorter than the exposure time of a single frame. We have developed a technique that allows us to correctly account for and exclude the contribution of variable atmospheric lines in the spectra of extended objects. This technique has been successfully tested in spectroscopic studies of the star-forming region NGC 7538 (S158) in our Galaxy. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2604_14863 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Sky background accounting in spectral infrared observations of extended objects at the Caucasus Mountain Observatory of the SAI MSU Gusev, A. S. Tatarnikov, A. M. Zheltoukhov, S. G. Kirsanova, M. S. Instrumentation and Methods for Astrophysics The Caucasus Mountain Observatory of the Sternberg Astronomical Institute of Moscow State University is the only one in Russia and one of the few in the world where is possible to obtain spectral data in the near-infrared (IR) range at $λ$=1-2.5 $μ$m. However, there is a problem of processing the spectra of extended objects, the angular dimensions of which exceed the length of the slit (4.5 arcmin). Obtaining additional spectra of the sky in the immediate vicinity of such objects does not solve the problem, since bright atmospheric hydroxyl lines at $λ$~2 $μ$m change their intensity significantly over a time shorter than the exposure time of a single frame. We have developed a technique that allows us to correctly account for and exclude the contribution of variable atmospheric lines in the spectra of extended objects. This technique has been successfully tested in spectroscopic studies of the star-forming region NGC 7538 (S158) in our Galaxy. |
| title | Sky background accounting in spectral infrared observations of extended objects at the Caucasus Mountain Observatory of the SAI MSU |
| topic | Instrumentation and Methods for Astrophysics |
| url | https://arxiv.org/abs/2604.14863 |